When a threat is made against Princess Twilight Sparkle, Shining Armor gives her a guard. But because Armor doesn't want to scare his sister, the guard goes undercover to become her coltfriend. To their astonishment, it works! But what happens when the guard falls in love with the princess? (AU tag because Equestria Girls does not take place.)

This is my first real fic, so constructive criticism is welcome.

And comments are appreciated.